Can't speak for all, obviously, but I was raised a Presyberterian, attended a Methodist church for awhile, and for the past 20 years go to a non-denominational church.
All took communion as seriously as Christ himself intended for it to be taken, and non would've batted an eye if a catholic present took the sacrament along with everyone else.
All of your churches are in the reformed tradition; that is: Christ is thought to be present in spirit only. The Catholic belief is that communion hosts becomes the actual body and Blood of Christ.
If one belief is correct, the other is incorrect.